Heya, I'm a product manager at Stripe working on just the thing! You're right, historically we have not helped out much here, but we've been working on some new products to remedy that. I'd be happy to share more and see if it meets your needs, or more importantly understand exactly what you would want to see from Stripe w/r/t tax. Email: kmoriarty@stripe.com
I spent a chunk of the Christmas period figuring out international B2B and B2C invoicing requirements, the rules for cross-border VAT/GST/BTW (UK [pre- and post-Brexit]/Australia/Netherlands/EU) sales tax, and when sales tax may be reclaimed on "invalid" invoices.
It was a surprisingly engrossing endeavor. There is a satisfying underlying logical consistency (from the point of view of a non-accountant). I even toyed with codifying the rules in a machine-executable form...